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Dec 6th 2016, 04:12 PM   #1
 HalcyonSon's Avatar
 
  Apr 2016
  Renton

AVDS - Automatic Variable Damping System

Saw something strange at Backfire Moto a wihle back, forgot about it for a time, and finally discovered the answer. The bike? A Kawasaki GPZ900R. The strange gizmo with fins on the front fork? AVDS - Automatic Variable Damping System. Closely related (in concept) to the Honda TRAC - Torque Reactive Anti-Dive Control which I've also seen but never looked up.

AVDS

Quote:
AVDS was a supplemental hydraulic cylinder mounted on the front of the fork legs which was connected to both the brake lines and the hydraulic fluid inside the telescopic forks. The idea was that as you applied the brakes, this unit would use the pressure in the brake line against a plunger to close a control valve. This valve restriced the flow of fork oil and thus stiffened the suspension. Stiffer suspension meant less dive. Anti-dive units mostly featured a dial adjuster on them, normally at the base. This was a way of affecting how much the anti-dive plunger moved, which meant the rider could make the anti-dive more or less severe.
Car Bibles: Motorbike suspension types and how they work.

TRAC
Dec 6th 2016, 07:11 PM   #2
 Wrench's Avatar
 
  Jan 2016
  West Richland, WA

Are you posting this to make a statement, or ask a question?

This "technology" pretty much became obsolete when the cartridge forks arrived on the scene.
Dec 7th 2016, 06:44 AM   #3
 Nathan's Avatar
 
  Jan 2016
  space needle

No pics of the GPZ? tsk tsk
Dec 7th 2016, 08:54 AM   #4
 FZ1Mike's Avatar
 
  Sep 2016
  Kenmore

  2005 Fz1 The Fazer
My night hawk had anti dive but it was a joke.
Dec 7th 2016, 01:57 PM   #5
 HalcyonSon's Avatar
 
  Apr 2016
  Renton

Quote:
Originally Posted by Wrench
Are you posting this to make a statement, or ask a question?

This "technology" pretty much became obsolete when the cartridge forks arrived on the scene.
Just as a "Now I know." I cam across it while reading about Hossack suspension and other random moto tech. Somewhere along the line, I saw a Ducati with a trellis double-wishbone front suspension that matched its trellis frame and supposedly lightened the bike by ten pounds.
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